Kaloyan Tenchov 7367741ac1 feat(image-generation): add Gemini provider support
Adds GeminiImageGenerationClient covering both Imagen 4 (:predict) and
Gemini Flash (:generateContent), wires the gemini ProviderConfig through
the SDK, API server, and gateway entry points, and updates the
image-generation docs and skill. Errors from the Gemini endpoints are
logged and surface with the HTTP status and parsed message instead of an
empty string.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-19 15:35:19 +08:00
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